Water mixer



Feb. 20, 1934. Q MYERS ETAL 1,948,044

WATER MIXER Filed April 4, 1931 INVENTORJ. (/OJfP/l I44 MYHPJ.

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Patented F eb. 20, 1934 PATENT OFFICE wA'rEn, MIXER Joseph w. Myers, Philadelphia, Pa., and Ernest I E. Murray, Jackson, Mich.

Application April 4, 1931. Serial No. 527,740 1 Claim. (Cl. 137-165) Our invention relates to water mixers and an object of our improvements is to provide for the delivery of water at a uniform temperature even if the pressure in a hot and cold water supply line varies.

We attain this object by the apparatus illustrated in the accompanying drawing, in which:--

Figure 1 is a perspective view of an apparatus embodying our invention, and so much of the water supply apparatus as is necessary to illustrate its connection therewith.

Figure 2 is a sectional elevation in the plane through the center of the casing.

Figure 3 is a detail sectional view on the line III, 111, Fig. 2.

2 is the cold water main and 3 is the hot water main. 4, 4 is a casing interposed in the mains 2 and 3. The mains 2 and 3 extend in parts 2a and 'be automatically maintained, notwithstanding any variation in the pressures in ordinary use.

4a is a passage in the casing"; with which the main 2 connects, 4b is a similar passage with which the main 3 connects. 4c is a contracted orifice for the delivery of hot water from the casing 4. 4d is an orifice similar-to the orifice 4c, through which cold water received in the casing 4, from the main 2, is delivered from said casing.

5 is a chamber in the casing 4 between the passages 4a and 4b. 4e is a port through the wall of the passage 4a communicating with the chamher 5, and 4,1 is a similar port axially in line with the port 4e through the wall of the passage 4b and communicating with the chamber 5. 6 is sylphon forming, with the attaching flange and thimble hereinafter described, a flexible partition dividing the chamber 5 into two compartments so that the port 4e communicates with one of said compartments and the port 4f with the other.

The sylphon 6 surrounds the stem 7 between the valves 7a and 7b and has a flange extending outward around one end which is secured to the casing i at its outer edge. 6a is a thimble surrounding the stem 7 within the sylphon 6 having one end connected to the free end of the sylphon 6 extending to the other end oi said sylphon and being there secured to the stem 7. By this means we secure compactness and freedom of movement of the valves.

7 is a valve stem secured at its central portion to the partition 6 as above-desoribed. 7a is a valve on the stem 7, adapted to control the area of opening through the port 4e-and 7b is a similar valve at the other end of the stem 7 adapted to control the area of the.port 4f.

8 is a non-return valve in the delivery passage for cold water, from the casing 4, and 9 is a similar non-return valve in the delivery passage for the hot water from said casing.

The operation of the above described apparatus is as follows:-

The cold water, under the pressure of the main, passes into the pa'ssage 4a and through the port 4e, and the water from the hot main 3 passes through the passage 42; and port 4f into the chamber 5 on the other side of the partition 6.

25 is a cock in the delivery pipe 23.

When the cooks 2c and 3c are adjusted to secure the desired temperature of the water passing into the conduit 23, the partition 6 moves the valves 7a and 7b automatically to positions corresponding to the relative drafts upon two mains. Should, now, the pressure in one main, as for instance 2, be suddenly diminished by a draft thereon, as for instance, by opening the cock 2b,

the partition 6 will automatically adjust the valves 7a and 7b so that the water from the two mains will continue to flow to the delivery conduit in the same proportion as before.

To positively prevent mixing of water between supply mains 2 and 3, in case flow from 23 is controlled only by valve 25, we sometimes place a non-return valve 8 or 9 in each of the conduits leading from the casing 4.

If the cold water supply, for instance, should fail completely, the hot water supply will be cut off entirely.

It .is to be noted that no springs are employed and that orifices 4c and 4d tap sources of hot and cold water respectively, that are always equal in pressure due to the action of the pressure balancing diaphragm 6.

The partition 6 is flexible laterally" as well as longitudinally of the valve stem 7, thus constituting a universally displaceable diaphragm secured to the rod '7 intermediate its ends, so that said rod is not constrained laterally by said diaphragm.

The valves 7a and 7b have longitudinally ex-' tending channels that open at the inner end or said valves and at the sides of the same. These valves reciprocate in apertures, the'walls of which 2 intense control the amount of opening of the inlet to said channels. This construction regulates the flow and delivery of water passing by the valves and the effect of the motion of the fluid on the pressure of the same against the valves.

What we claim is:

In an apparatus of the kind described, the combination of a delivery conduit for combined fluids, a supply conduit for each of said fluids severally communicating with said delivery conduit, a valve controlling the flow of fluid into one of said supply conduits, a valve controlling the flow of fluid into the other of said supply conduits, said valves being connected by a common stem extending between and coaxial with the same. means for guiding the movement of said valves, a sylphon surrounding said valve stem between said valves and exposed to the fluid pressure of one of said supply conduits on one surface and to the pressure of the other of said supply conduits on the other surface, a thimble surrounding said stem coaxial therewith within said sylphon and secured at one end to an otherwise free end of said sylphon and at the other end to said stem between said valves whereby the movement of said valves andstem is unconstrained except for said guiding means, the end of said sylphon secured by said thimble to said stem being free to move at right angles to the motion of said stem except for said connection to said stem.

JOSEPH W. MYERS.

ERNEST E. MURRAY. 

